Why I am not able do QB Desktop File Condense ?

I'd be happy to provide you with more information on condensing your QuickBooks Desktop, Ghaffar.

When condensing your file, the system will automatically detect and display changes. If you have previously condensed your company file, please note that this action is irreversible. 

The only option we can use is the second choice.

For more information about the process, please visit this page: Use the Condense Data utility.

I'm sharing this article to assist you in resolving common data issues in QuickBooks Desktop: Fix data damage on your company file.

Feel free to keep your questions coming if you need more assistance with condensing your files. I’ll be right here to help you every step of the way.

@Ghaffar796 

Have you condensed your file before? If the option is not available, you can purchase a 3rd party service to remove the audit trail data if required.

Based on the message you're getting, there are currently no audit trail records in the file. Or, the audit trail is so small that it rounds to zero:

That's probably why you can't select the option (because it would have no effect on your file).